The CMMG Dissent MK4 is a semi-automatic 5.56x45mm NATO pistol built around CMMG's short-stroke gas piston system. At 4.60 lbs with a 6.5-inch barrel and 14.7-inch overall length, it's compact — shorter than most comparable AR pistols at this caliber. 
 

Key Specifications 

• Model: Dissent MK4 
• Caliber: 5.56x45mm NATO 
• Action: Semi-Auto 
• Capacity: 30+1 rounds 
• Barrel Length: 6.5 inches 
• Overall Length: 14.7 inches 
• Weight: 4.60 lbs 
• Sights: Optic Ready 
• Safety: Ambidextrous 
• Frame Material: Aluminum 
• Grip: Black Polymer 
• Condition: New in Box 
   

Detailed Features 

• Short-Stroke Gas Piston: Differs from standard DI AR pistols; keeps the action cooler and reduces fouling in the lower. 
• Optic Ready: No iron sights included; mount your preferred optic directly. 
• Ambidextrous Safety: Works for left- and right-handed shooters without modification. 
• 30+1 Capacity: Accepts standard AR magazines.

Community discussion on the CMMG Dissent MK4 in Tungsten/Black is largely positive, with a few practical concerns.

The compact size and 4.60 lb weight draw consistent praise — it's maneuverable and easy to carry compared to longer AR pistols. Build quality also comes up often; CMMG's materials and machining are well-regarded. The short-stroke piston system is a talking point for enthusiasts who prefer it over DI, and the optic-ready configuration gets positive marks from shooters who want to run their own glass. Accuracy and recoil management in range reports are generally solid.

On the downside: price is the most common complaint, with some feeling it's high relative to competing platforms. Accessory availability is tighter than for standard AR pistols due to the Dissent's unique geometry. A few users note the weight distribution shifts when adding optics or a light, which can feel front-heavy. Shooters transitioning from standard AR platforms also mention a short adjustment period with the controls.

Overall a well-built and thoughtfully designed pistol — the price premium is real, but the piston system and compact form factor justify it for the right buyer.